Kaizu Castle

Kaizu Castle was a Japanese castle located in Shinano Province, Japan.

History
In 1561, Shingen Takeda used Kaizu Castle as a base before the Fourth Battle of Kawanakajima, as it was located close to the Hachimanbara plain where the forces met for the fourth time in eight years. Uesugi spies found out that the Takeda army was to be divided in half when they observed movement in the castle at night, which would tip the scales in their favor.